Federal officials hunted for the source of a 17-state salmonella outbreak linked to three types of raw tomatoes, while the list of supermarkets and restaurants yanking those varieties from shelves and menus grew.

Federal officials hunted for the source of a 17-state salmonella outbreak linked to three types of raw tomatoes, while the list of supermarkets and restaurants yanking those varieties from shelves and menus grew.

Federal officials hunted for the source of a 17-state salmonella outbreak linked to three types of raw tomatoes, while the list of supermarkets and restaurants yanking those varieties from shelves and menus grew.

Federal officials hunted for the source of a 17-state salmonella outbreak linked to three types of raw tomatoes, while the list of supermarkets and restaurants yanking those varieties from shelves and menus grew.

Times are lean in the restaurant industry, and Darden Restaurants, the world's largest casual dining operator, will have to grow if it wants to stay at the top. The company plans aggressive expansion of its already-ubiquitous Olive Garden, and might even buy another restaurant chain.